1936. 1대1 가위바위보

package oSWExpertAcademy;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class D1_1936 {
    public static void main(String[]args) {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        try {
            String[] input = br.readLine().split(" ");
            int A = Integer.parseInt(input[0]);
            int B = Integer.parseInt(input[1]);
            if(A-B == 1 || A-B == -2) {
                System.out.println("A");
            }else {
                System.out.println("B");
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}